<html>
  <head>
    base head
  
  <span wicket:id="headerLabel">my header</span>
</head>
  <body>
    111<span wicket:id="label1">0</span>222
    <wicket:child><wicket:extend>
   888<span wicket:id="label3">extension label</span>999
</wicket:extend></wicket:child>
    333<a href="./org.apache.wicket.markup.MarkupInheritanceExtension_7?0-1.-link" wicket:id="link">increment</a>444
  </body>
</html>
